Fixes #2946.

Documentation missing, but it will be done as part of documenting
variable conversion in general (#3278).

Part of #2946.

`datetime` conversion suppors a special value `now` and `date`
conversoin supports `today`.

Fixes #5440.

See #5083.

Issue #3278, PR #5436.

Earlier implementation of #5440 supported `now` only with `datetime`
and `today` only with `date`. This implementation is easier for users.

To some extend related to documenting variable type conversion
(#3278).

Earlier syntax was `${name:pattern: type}`, but now it is
`${name: type:pattern}`. This is more consistent with the general
variable type syntax `${name: type}`. Part of #3278.

Error messages enhanced in these cases:
- Embedded argument value is invalid.
- Argument default value is invalid.

- Explicit test for embedded args regexp with leading/trailig spaces.
- Add one test for type conversion also to embedded arguments suite.

Fixes #3278.

- Remove Python 2 reference
- Add section about type hints

Also some refactoring:
- Parse arguments to VariableMatch objects just once.
- Reorder methods.

Fixes #5443.

Hopefully this doesn't make tests flakey...

…yword

This only affects a situation where
- a name of an executed keyword contains a variable and
- the name matches a different keyword depending on are variables replaced or not.

After this change an exact match after variables have been resolved
has a precedence regardless what the original name would match.

Fixes #5444.

Most importantly, add custom type docs for Source and Element.

Related to #5541 and #5373.

Not needed anymore when XML has typing (#5541) that brings
documentation for the `bool` type automatically.

Hopefully this doesn't make tests flakey...

- Disable current timeouts when running keyword teardown to avoid them
  stopping execution.
- After teardown, check has any of timeouts exceeded during it.
- Timeouts set inside teardown are used normally.

Fixes #5474.

Also round time left in the "timeout active" debug message to three
decimals.

Fixes #5567.

Part of #5373. Fixes #5558.

---------

Co-authored-by: Clemens Otto <clemens.otto@rohde-schwarz.com>
Co-authored-by: Pekka Klärck <peke@iki.fi>

The value should be omitted altogether or '0' used instead.

Also add default value to `Get Substring` keyword's `start` argument
to actually allow omitting the value.

Fixes #5537.

Part of #5548.

Use newish Robot features to simplify tests.

Argument conversion handles conversion for us.

Part of #5548.

- Use templates to avoid duplication
- Make template keywords more generic

Fixes #5548.

This was already done with `Split To Lines` and `Get Substring`, but
now it is also done with `Split String`, `Split String From Right` and
`Generate Random String`.

Fixes #5537.

Fixes #5568.

Also enhance comments about other deprecations in RF 7.4. Now all have
a TODO about removing in RF 9. Possibly those that affect signatures
(`Literal[""]`) could be removed already earlier, with others there's
no real hurry.

Also some fine-tuning.